<template>
   <div>
      <!-- 面包屑导航区区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
         <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
         <el-breadcrumb-item>商品管理</el-breadcrumb-item>
         <el-breadcrumb-item>添加商品</el-breadcrumb-item>
      </el-breadcrumb>

      <!-- 卡片视图 -->
      <el-card>
         <!-- 头部的警告区域 -->
         <el-alert title="添加商品信息" type="info" :closable="false" show-icon center>
         </el-alert>

         <!--  步骤条区域-->
         <el-steps :active="activeIndex - 0" finish-status="success" align-center>
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
         </el-steps>

         <!-- tab栏区域 -->
         <el-form :model="addForm" :rules="addFormRules" ref="addFormRuleRef" label-width="100px" label-position="top">
            <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave"
               @tab-click="tabClicked">
               <el-tab-pane label="基本信息" name="0">
                  <el-form-item label="商品名称" prop="goods_name">
                     <el-input v-model="addForm.goods_name"></el-input>
                  </el-form-item>
                  <el-form-item label="商品价格" prop="goods_price">
                     <el-input v-model="addForm.goods_price" type="number"></el-input>
                  </el-form-item>
                  <el-form-item label="商品重量" prop="goods_weight">
                     <el-input v-model="addForm.goods_weight" type="number"></el-input>
                  </el-form-item>
                  <el-form-item label="商品数量" prop="goods_number">
                     <el-input v-model="addForm.goods_number" type="number"></el-input>
                  </el-form-item>
                  <el-form-item label="商品分类" prop="goods_cat">
                     <!-- 级联选择器 -->
                     <el-cascader v-model="addForm.goods_cat" :options="catelist"
                        :props="{ expandTrigger: 'hover', ...cateProps }" @change="handleChange" clearable>
                     </el-cascader>
                  </el-form-item>
               </el-tab-pane>
               <el-tab-pane label="商品参数" name="1">
                  <!-- 渲染表单的Item项 -->
                  <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                     <!-- 复选框组 -->
                     <el-checkbox-group v-model="item.attr_vals">
                        <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
                     </el-checkbox-group>
                  </el-form-item>
               </el-tab-pane>
               <el-tab-pane label="商品属性" name="2">
                  <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                     <el-input v-model="item.attr_vals"></el-input>
                  </el-form-item>
               </el-tab-pane>
               <el-tab-pane label="商品图片" name="3">
                  <!-- action 表示图片要上传到的后台api地址 -->
                  <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove"
                     list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                     <el-button size="small" type="primary">点击上传</el-button>
                  </el-upload>
               </el-tab-pane>
               <el-tab-pane label="商品内容" name="4">
                  <!-- 富文本编辑器组件 -->
                  <quill-editor v-model="addForm.goods_introduce">
                  </quill-editor>
                  <!-- 添加商品的按钮 -->
                  <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
               </el-tab-pane>
            </el-tabs>
         </el-form>
      </el-card>

      <!-- 图片预览 -->
      <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
         <img :src="previewPath" alt="" class="previewImg">
      </el-dialog>
   </div>
</template>

<script>
import _ from 'lodash'

export default {
   name: 'Add',
   data() {
      return {
         activeIndex: '0',
         // 添加商品的表单数据对象
         addForm: {
            goods_name: '',
            goods_price: 0,
            goods_weight: 0,
            goods_number: 0,
            // 商品所属的分类数组
            goods_cat: [],
            // 图片的数组
            pics: [],
            // 商品的详情描述
            goods_introduce: '',
            attrs: []
         },
         addFormRules: {
            goods_name: [
               { required: true, message: '请输入商品名称', trigger: 'blur' }
            ],
            goods_price: [
               { required: true, message: '请输入商品价格', trigger: 'blur' }
            ],
            goods_weight: [
               { required: true, message: '请输入商品重量', trigger: 'blur' }
            ],
            goods_number: [
               { required: true, message: '请输入商品数量', trigger: 'blur' }
            ],
            goods_cat: [
               { required: true, message: '请选择商品分类', trigger: 'blur' }
            ],
         },
         // 商品分类列表
         catelist: [],
         cateProps: {
            label: 'cat_name',
            value: 'cat_id',
            children: 'children'
         },
         // 动态参数列表数据
         manyTableData: [],
         // 静态参数列表数据
         onlyTableData: [],
         // 上传图片的URL地址
         uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
         // 图片上传组件的headers请求头对象
         headerObj: {
            Authorization: window.sessionStorage.getItem('token')
         },
         previewPath: '',
         previewVisible: false,


      }
   },
   methods: {
      // 获取所有商品分类数据
      async getCateList() {
         const { data: res } = await this.$http.get(`categories`)
         if (res.meta.status !== 200) {
            return this.$message.error('获取商品分类数据失败!')
         }
         this.catelist = res.data
         console.log(this.catelist);
         this.$message.success('获取商品分类数据成功!')

      },
      // 级联选择器选中项变化会触发这个函数
      handleChange() {
         console.log(this.addForm.goods_cat);
         if (this.addForm.goods_cat.length !== 3) {
            this.addForm.goods_cat = []
         }
      },
      beforeTabLeave(activeName, oldActiveName) {
         // console.log(oldActiveName);
         // console.log(activeName);
         if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
            this.$message.error('请先选择商品分类')
            return false
         }
      },
      // 点击标签页时的处理事件
      async tabClicked() {
         // console.log(this.activeIndex);
         // 证明访问的是动态参数面板
         if (this.activeIndex === '1') {
            // console.log('动态参数');
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
            if (res.meta.status !== 200) {
               return this.$message.error('获取动态参数列表失败!')
            }
            console.log(res.data)
            this.manyTableData = res.data

            res.data.forEach(item => {
               item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
            })
         } else if (this.activeIndex === '2') {
            // console.log('静态属性');
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
            if (res.meta.status !== 200) {
               return this.$message.error('获取静态属性失败!')
            }
            console.log(res.data)
            this.onlyTableData = res.data
         }
      },
      // 处理图片预览效果
      handlePreview(file) {
         console.log(file);
         this.previewPath = file.response.data.url
         this.previewVisible = true
      },
      //处理移出图片的操作
      handleRemove(file) {
         console.log(file);
         // 获取将要删除的图片的临时路径
         const filePath = file.response.data.tmp_path

         // 从pics数组中 找到这个图片对应的索引值
         const i = this.addForm.pics.findIndex(x => x.pic === filePath)
         // 调用数组的splice方法,把图片信息对象从pics数组中移除 
         this.addForm.pics.splice(i, 1)
         console.log(this.addForm);
      },
      // 监听图片上传成功的事件
      handleSuccess(response) {
         console.log(response);
         //1 拼接得到一个图片信息对象
         const picInfo = { pic: response.data.tmp_path }
         // 2 将图片信息对象push到pics数组中
         this.addForm.pics.push(picInfo)
         console.log(this.addForm);
      },
      add() {
         this.$refs.addFormRuleRef.validate(async valid => {
            if (!valid) {
               return this.$message.error('请填写必要的表单项!')
            }
            // 执行添加的业务逻辑
            // lodash cloneDeep(obj) 深拷贝
            const form = _.cloneDeep(this.addForm)
            form.goods_cat = form.goods_cat.join(',')
            // 处理动态参数
            this.manyTableData.forEach(item => {
               const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals.join(' ') }
               this.addForm.attrs.push(newInfo)
            })
            // 处理静态属性
            this.onlyTableData.forEach(item => {
               const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
               this.addForm.attrs.push(newInfo)
            })
            form.attrs = this.addForm.attrs
            // console.log(form);

            // 发起请求添加商品
            // 商品的名称 必须是唯一的
            const { data: res } = await this.$http.post('goods', form)
            // console.log(res);
            if (res.meta.status != 201) {
               return this.$message.error('添加商品失败!')
            }
            this.$message.success('添加商品成功!')
            this.$router.push('/goods')
         })
      }
   },

   computed: {
      cateId() {
         if (this.addForm.goods_cat.length === 3) {
            return this.addForm.goods_cat[2]
         }
      }
   },
   created() {
      this.getCateList()
   },
}
</script>

<style lang="less" scoped>
.el-checkbox {
   margin: 0 5px 0 0 !important;
}

.previewImg {
   width: 100%
}

.btnAdd {
   margin-top: 15px;
}
</style>